I’m not positive we’re alone in this universe. I’ve never been to Area 51 and poked and prodded the aliens that are probably hanging out there with Will Smith and Tommy Lee Jones. Evidence of some ET activity was recently spotted over the St. Louis Arch, though. At least, that’s what people think they saw.

The video above, published by the Metro East Park and Recreation District, shows the mysterious light flying up above the arch and back down again (or off into the distance, it’s hard to tell from the angle and the pretty poor CCTV footage.) “We guarantee you will be perplexed if you watch all 5 minutes of this surveillance footage,” the Malcom W Martin Memorial Park posted on its official Twitter page. “Best viewed on a PC in HD.”

My guess is it’s a drone, possibly one that was turning on a bright light at different parts of the flight. I won’t be disappointed if a green guy shows up at the St. Louis City Hall over the weekend, either. Watch the video below and let us know what you think.